CN220768186U - Testing device for multi-suction barrel combined foundation under earthquake and environmental load - Google Patents
Testing device for multi-suction barrel combined foundation under earthquake and environmental load Download PDFInfo
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- CN220768186U CN220768186U CN202321693236.9U CN202321693236U CN220768186U CN 220768186 U CN220768186 U CN 220768186U CN 202321693236 U CN202321693236 U CN 202321693236U CN 220768186 U CN220768186 U CN 220768186U
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Abstract
The utility model discloses a testing device for a multi-suction bucket combined foundation under earthquake and environmental load, wherein a multi-bucket foundation formed by combining a plurality of suction buckets and a rigid connecting frame is spliced in an analog reality environment in an environment simulation unit; the inclination angle of the force application end of the tension loading unit is adjusted and mounted on the shape center of the rigid connecting frame; the multi-barrel basic posture monitoring unit is arranged above the rigid connecting frame and monitors the displacement change of the barrel top of the suction barrel; the servo monitoring control unit collects the pore pressure, soil pressure and acceleration data of the environment simulation unit, collects the displacement and tension data of the tension loading unit, collects the barrel top displacement data of the multi-barrel basic posture monitoring unit, and finally the servo monitoring control unit servo controls the tension loading unit to apply tension load to the suction barrel. The test device provides a test platform for researching tensile bearing power characteristics of the multi-suction-barrel combined foundation under the combined action of earthquake and environmental load.
Description
Technical Field
The utility model relates to the technical field of ocean structure engineering, in particular to a testing device for a multi-suction bucket combined foundation under earthquake and environmental load.
Background
In recent years, with the development and utilization of ocean resources gradually shifted to deep sea, floating oil extraction platforms suitable for deep sea oil and gas exploitation and floating offshore wind turbines for deep sea wind power generation are increasingly widely applied. These offshore floating structures typically require the use of anchor chains to connect them to some type of anchoring foundation, which is embedded in the sea bed, to maintain the stability of the floating structure. The multi-barrel foundation is a common deep sea anchoring foundation type, and has the advantages of convenient installation, lower manufacturing cost, recycling and the like, and has wide application prospect.
In complex marine environments, multi-bucket foundations are often placed in tension due to the buoyancy experienced by the floating structure. On one hand, the earthquake-resistant water tank is subjected to the action of environmental loads such as wind, waves and currents, and on the other hand, the earthquake-resistant water tank is also subjected to the threat of earthquake action. Therefore, reasonable evaluation of the tensile load-bearing power characteristics of the multi-barrel foundation under the combined action of earthquake and environmental load is very important for disaster-resistant design of the multi-barrel foundation.
However, the research on the dynamic behavior of the multi-barrel foundation under the combined action of earthquake and environmental load is very limited at present, the understanding of the tensile bearing dynamic characteristic of the multi-barrel foundation is far insufficient, and one of the key reasons is the lack of a test device and a test method capable of effectively measuring the tensile bearing dynamic characteristic of the multi-barrel foundation under the combined action of earthquake and environmental load.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, provides a testing device and a testing method for a multi-barrel foundation under earthquake and environmental load, and provides a testing platform and a method basis for researching tensile bearing power characteristics of the multi-barrel foundation under the combined action of the earthquake and the environmental load.
A testing device of a multi-suction bucket combined foundation under earthquake and environmental load comprises an environmental simulation unit, a tension loading unit, a multi-bucket foundation posture monitoring unit and a servo monitoring control unit; the environment simulation unit simulates a real environment to be spliced with a multi-barrel foundation formed by combining a plurality of suction barrels and rigid connecting frames; the inclination angle of the force application end of the tension loading unit is adjusted and mounted on the shape center of the rigid connecting frame; the multi-barrel basic posture monitoring unit is arranged above the rigid connecting frame and monitors the displacement change of the barrel top of the suction barrel; the servo monitoring control unit collects the pore pressure, soil pressure and acceleration data of the environment simulation unit, collects the displacement and tension data of the tension loading unit, collects the barrel top displacement data of the multi-barrel basic posture monitoring unit, and finally the servo monitoring control unit servo controls the tension loading unit to apply tension load to the suction barrel.
Preferably, the environment simulation unit comprises a vibrating table, an experiment model box and a bottom plate, wherein the bottom plate is fixedly arranged on the vibrating table, and the experiment model box is fixedly arranged on the top surface of the bottom plate in a sealing way; a rubber film is paved on the inner wall of the experimental model box, a soft clay layer simulating the seabed environment is filled in the lower layer of the experimental model box, and a seawater layer is filled in the upper layer of the experimental model box; the soft clay layer is internally inserted with a suction barrel, and the barrel top of the suction barrel is flush with the mud surface of the soft clay layer.
Preferably, the tension loading unit comprises a loading actuator, a loading guide plate and a guide pulley, wherein the loading actuator is fixedly arranged above the environment simulation unit along the horizontal direction, and the output end of the loading actuator is connected with the centroid of the rigid connecting frame through a steel wire rope; the loading guide plate is fixedly arranged above the environment simulation unit along the vertical direction, a plurality of adjusting holes which are arranged at intervals are vertically distributed on the loading guide plate, and the adjusting holes are rotationally connected with the guide pulleys; the guide pulley is winded and connected with a steel wire rope.
Preferably, the multi-barrel foundation posture monitoring unit comprises a fixed frame and a cross steel frame; the cross steel frame comprises a vertical detection rod and a horizontal detection rod, wherein the bottom end of the vertical detection rod is coaxially connected with the rigid connecting frame through threads, and the middle part of the vertical detection rod is fixedly connected with the horizontal detection rod along the horizontal direction; the fixing frame is fixedly arranged above the suction barrel, and a horizontal displacement sensor and a vertical displacement sensor of the servo monitoring control unit are arranged on the fixing frame; the detection end of the horizontal displacement sensor is abutted against the side wall of the vertical detection rod; a vertical displacement sensor; the detection end of the horizontal detection rod is abutted against the top surface of the horizontal detection rod.
Preferably, the servo monitoring control unit further includes: loading a displacement sensor, an S-shaped force sensor, an acceleration sensor, a pore pressure sensor, a soil pressure gauge, a servo controller, a data acquisition instrument and a computer; the output end of the loading displacement sensor is fixedly connected with the output end of the loading actuator; the two ends of the S-shaped force sensor are respectively connected with the output end of the loading actuator and the centroid of the rigid connecting frame through steel wire ropes; the pore pressure sensor and the soil pressure gauge are respectively embedded in the soft clay layers inside and around the two non-adjacent suction barrels; the acceleration sensors are vertically and alternately distributed in the soft clay layer; the data acquisition instrument acquires pore pressure, soil pressure and acceleration data in the soft clay layer, acquires displacement and load data of the loading actuator and displacement data of the barrel tops of two non-adjacent suction barrels, and finally sends the displacement data to the computer, and the loading force and loading mode of the loading actuator are controlled by the servo controller according to the instructions of the computer.
Preferably, the suction barrels are provided with four, the tops of the four suction barrels are connected with rigid connecting frames, the top surface of each suction barrel is provided with a water pumping hole and an observation hole with sealing organic glass, and the middle part of the top surface of each suction barrel is provided with a screw hole connected with the rigid connecting frame in a threaded manner.
The utility model has the advantages and technical effects that:
1. according to the testing device for the multi-suction barrel combined foundation under earthquake and environmental load, the center of the top of the suction barrel is connected with the cross steel frame through the rigid connecting frame, so that the horizontal displacement and the vertical displacement of the barrel can be conveniently measured; and a row of holes are formed in the loading guide plate, the guide pulley can be fixed on the guide plate through bolts at any hole position, the steel wire rope is connected with the rigid connecting frame after bypassing the guide pulley, and the drawing loading of the multi-barrel foundation under different inclination angles can be realized by adjusting the position of the guide pulley.
2. The testing device for the multi-suction barrel combined foundation under the earthquake and environmental load can apply the earthquake load and the inclined cyclic drawing load to the suction barrel at the same time, and can simulate the stress situation of the multi-suction barrel combined foundation connected with the floating fan or the floating oil extraction platform in the ocean environment under the earthquake and environmental load.
3. The testing device for the multi-suction bucket combined foundation under the earthquake and environmental load can effectively measure the drawing bearing power characteristics of the multi-suction bucket combined foundation in the soft soil foundation under the combined action of the earthquake and the environmental load, obtain the dynamic load displacement response, the bearing capacity and the rigidity change rule of the multi-suction bucket combined foundation, the development rule of pore water pressure around two non-adjacent suction buckets and the change rule of passive soil pressure and active soil pressure of the bucket wall, and reveal the power bearing mechanism of the multi-suction bucket combined foundation from the angle of effective stress.
Drawings
FIG. 1 is a schematic diagram of a dynamic characteristic test apparatus according to the present utility model;
FIG. 2 is a schematic diagram of a multi-bucket foundation connection of the present utility model;
FIG. 3 is a top view of the multi-tub foundation of the present utility model;
FIG. 4 is a sensor vertical profile of the present utility model;
FIG. 5 is a sensor level distribution diagram of the present utility model;
FIG. 6 is a front view of the laminar shear test box of the present utility model;
in the figure: 10. an experimental model box; 11. a rubber film; 12. an acceleration sensor; 13. a pore pressure sensor; 14. a soil pressure gauge;
20. loading an actuator; 21. a wire rope; 22. loading a guide plate; 23. a guide pulley; 24. loading a displacement sensor; an s-type force sensor;
30. a suction barrel; 31. cross steel frame; 32. a water pumping hole; 33. an observation hole; 34. a horizontal displacement sensor; 35. a vertical displacement sensor; 36. a rigid connection frame;
40. a vibration table; 41. a bottom plate;
50 fixing frames; 60. a servo controller; 70. a data acquisition instrument; 80. and a computer.
Detailed Description
For a further understanding of the nature, features, and efficacy of the present utility model, the following examples are set forth to illustrate, but are not limited to, the utility model. The present embodiments are to be considered as illustrative and not restrictive, and the scope of the utility model is not to be limited thereto.
A testing device of a multi-suction bucket combined foundation under earthquake and environmental load comprises an environmental simulation unit, a tension loading unit, a multi-bucket foundation posture monitoring unit and a servo monitoring control unit; the environment simulation unit simulates a real environment and is spliced with a multi-barrel foundation fixed through a rigid connecting frame; the force application end inclination angle of the tension loading unit is adjusted and mounted on the shape center of the rigid connecting frame 36; the multi-barrel basic posture monitoring unit is arranged above the rigid connecting frame and monitors the displacement change of the barrel top of the suction barrel 30; the servo monitoring control unit collects the pore pressure, soil pressure and acceleration data of the environment simulation unit, collects the displacement and tension data of the tension loading unit, collects the barrel top displacement data of the multi-barrel foundation posture monitoring unit, and finally the servo monitoring control unit servo controls the tension loading unit to apply tension load to the multi-barrel foundation.
Preferably, the environment simulation unit comprises a vibrating table 40, an experiment model box 10 and a bottom plate 41, wherein the bottom plate is fixedly arranged on the vibrating table, and the experiment model box is fixedly arranged on the top surface of the bottom plate in a sealing way; a rubber film 11 is paved on the inner wall of the experimental model box, a soft clay layer simulating the seabed environment is filled in the lower layer of the experimental model box, and a seawater layer is filled in the upper layer of the experimental model box; a multi-barrel foundation is inserted in the soft clay layer, and the barrel tops of the multi-barrel foundation are all flush with the mud surface of the soft clay layer.
Preferably, the tension loading unit comprises a loading actuator 20, a loading guide plate 22 and a guide pulley 23, wherein the loading actuator is fixedly arranged above the environment simulation unit along the horizontal direction, and the output end of the loading actuator is connected with the centroid of the rigid connecting frame through a steel wire rope 21; the loading guide plate is fixedly arranged above the environment simulation unit along the vertical direction, a plurality of adjusting holes which are arranged at intervals are vertically distributed on the loading guide plate, and the adjusting holes are rotationally connected with the guide pulleys; the guide pulley is winded and connected with a steel wire rope.
Preferably, the multi-barrel foundation monitoring unit comprises a fixing frame 50 and a cross steel frame 31; the cross steel frame comprises a vertical detection rod and a horizontal detection rod, wherein the bottom end of the vertical detection rod is coaxially connected with the rigid connecting frame through threads, and the middle part of the vertical detection rod is fixedly connected with the horizontal detection rod along the horizontal direction; the fixed mount is fixedly arranged above the multi-barrel foundation, and is provided with a horizontal displacement sensor 34 and a vertical displacement sensor 35 of the servo monitoring control unit; the detection end of the horizontal displacement sensor is abutted against the side wall of the vertical detection rod; the detection end of the vertical displacement sensor is abutted against the top surface of the horizontal detection rod.
Preferably, the servo monitoring control unit further includes: the loading displacement sensor 24, the S-shaped force sensor 25, the acceleration sensor 12, the pore pressure sensor 13, the soil pressure gauge 14, the servo controller 60, the data acquisition instrument 70 and the computer 80; the output end of the loading displacement sensor is fixedly connected with the output end of the loading actuator; the two ends of the S-shaped force sensor are respectively connected with the output end of the loading actuator and the centroid of the rigid connecting frame through steel wire ropes; the pore pressure sensors and the soil pressure gauge are buried in the soft clay layers inside and around the two non-adjacent suction barrels; the acceleration sensors are vertically and alternately distributed in the soft clay layer; the data acquisition instrument acquires pore pressure, soil pressure and acceleration data in the soft clay layer, acquires displacement and load data of the loading actuator and displacement data of the barrel tops of two non-adjacent suction barrels, and finally sends the displacement data to the computer, and the loading force and loading mode of the loading actuator are controlled by the servo controller according to the instructions of the computer.
Preferably, the multi-barrel foundation consists of 4 suction barrel foundations and a rigid connecting frame, a water pumping hole 32 and an observation hole 33 with sealing organic glass are formed in the top surface of the suction barrel, and a connecting hole connected with the rigid connecting frame is formed in the middle of the top surface of the suction barrel.
In addition, the rigid connecting frame is preferably a cross hinge frame or a cross fixing frame in the prior art.
In addition, the experimental model box is preferably a laminar shear box in the prior art.
In order to more clearly describe the specific embodiments of the present utility model, an example is provided below:
as shown in FIG. 1, the test device and the test method for the multi-barrel foundation under earthquake and environmental load comprise an experiment model box 10, a suction barrel 30, a vibrating table 40, a loading actuator 20, an acceleration sensor 12, a hole pressure sensor 13, a soil pressure gauge 14, a loading guide plate 22, an S-shaped force sensor 25, a fixing frame 50, a servo controller 60, a data acquisition instrument 70, a computer 80 and a plurality of displacement sensors.
As shown in fig. 1, the experimental model box 10 is a stainless steel rectangular laminar shear box. Soft clay and seawater are filled in the experiment box; a layer of rubber film 11 is paved on the inner wall of the experiment box so as to realize the side wall wave-absorbing effect.
As shown in fig. 1, the experimental simulation box 10 is placed on a vibration table 40, and a vibration table is used to apply a seismic load to a multi-tub foundation; the tail end of the loading actuator 20 is connected with the servo controller 60, the front end of the actuator is finally connected with the wall of the suction barrel through the steel wire rope 21, and the loading actuator is controlled by the servo controller, so that monotonous or cyclic drawing load can be applied to the suction barrel; an S-shaped force sensor 25 is arranged in the middle of the steel wire rope and is used for measuring the drawing load.
As shown in fig. 2, the top of the barrel is provided with a water pumping hole 32 and an observation hole 33, and transparent high-strength organic glass is embedded in the observation hole, so that the change condition of the soil plug in the barrel can be conveniently observed.
A method for testing tensile load-bearing dynamic characteristics of a suction barrel foundation under earthquake and environmental loads comprises the following steps.
Step 1, paving a seabed: a layer of rubber film 11 is paved on the inner wall of the experiment box 10, soft clay is filled in the experiment box, and an acceleration sensor 12, a pore pressure sensor 13 and a soil pressure gauge 14 are buried in a preset position in the filling process; and after the filling is completed, filling a sea water layer on the surface of the soft clay.
Step 2, suction anchor penetration: comprises a gravity penetration stage and a negative pressure penetration stage; firstly, the self weight of the suction barrel 30 is utilized to penetrate the suction barrel to a certain depth, so that a closed space is formed between the barrel and the soil body; and then the vacuum pump is connected with the pumping hole 32 at the top of the suction barrel, negative pressure is applied to the 4 suction barrels simultaneously by the vacuum pump, the suction barrels are gradually penetrated under the action of the negative pressure until the barrel top is flush with the mud surface, and the penetration is finished. In the process of the suction barrel penetration, the change condition of the soil plug in the barrel can be observed through the transparent observation hole 33 at the top of the barrel, so that the negative pressure can be adjusted in real time, and the phenomenon of the rising of the soil plug in the barrel can be avoided.
Step 3, distributing force and displacement sensors: the S-shaped force sensor 25 is mounted on the wire rope 21 connecting the actuator 20 and the rigid connection frame, and measures the pulling force (i.e., the pulling force received by the suction barrel) applied by the wire rope. The position of the guide pulley 23 on the guide plate 22 is adjusted according to the set loading direction, and the wire rope is fixed at the front end of the loading booster by bypassing the guide pulley. Displacement sensors for measuring vertical and horizontal displacement of two non-adjacent suction barrels are arranged on a fixed steel frame 50, and the force and displacement sensors are connected with a data acquisition instrument.
Step 4, load application: a typical sea area seismic wave is selected as a vibrating table to input seismic vibration, the peak acceleration and holding time of the seismic wave are set, and the vibrating table 40 is utilized to apply seismic load to model box soil and multi-barrel foundations; the method comprises the steps of simulating the action of wind and wave environment loads by using periodic sinusoidal cyclic loads, setting the amplitude, frequency (usually 0.1 Hz) and cyclic times of the cyclic loads, and applying inclined drawing loads to a multi-barrel foundation by using an actuator. In the test process, dynamic response data such as force, displacement, pore pressure and soil pressure in the whole barrel-soil interaction system are collected in real time by using the arranged sensors.
Step 5, tensile load-bearing dynamic characteristic analysis: the collected dynamic response data such as force, displacement, acceleration, pore pressure, soil pressure and the like are subjected to systematic carding and summarization, and the cyclic drawing load displacement response, dynamic bearing force and dynamic stiffness change rule of the multi-barrel foundation are deeply analyzed; and analyzing the acceleration amplification effect of soil around the barrel, pore pressure and soil pressure change rules, and revealing the failure mechanism of the soil under the combined action of earthquake and environmental load.
Preferably, the load displacement response of the multi-suction bucket combined foundation is obtained according to the collected force and displacement test data, the change rule of the dynamic bearing force and the rigidity is obtained, and the change rule of the vertical settlement, the horizontal displacement and the corner displacement of the multi-suction bucket combined foundation is obtained.
Preferably, according to the collected acceleration test data, the amplification effect of acceleration at different positions along the depth direction of the soil layer is obtained; according to the collected pore pressure and soil pressure data, a development rule of pore water pressure around the suction barrel and a change rule of passive soil pressure and active soil pressure of the barrel wall are obtained, and further the power bearing characteristic of the multi-suction barrel combined foundation is revealed from the angle of effective stress.
Finally, the utility model adopts the mature products and the mature technical means in the prior art.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (6)
1. A testing device for a multi-suction bucket combined foundation under earthquake and environmental load is characterized in that: the device comprises an environment simulation unit, a tension loading unit, a multi-barrel basic posture monitoring unit and a servo monitoring control unit; the environment simulation unit simulates an actual environment to be spliced with a multi-barrel foundation formed by combining a plurality of suction barrels and rigid connecting frames; the inclination angle of the force application end of the tension loading unit is adjusted and mounted on the shape center of the rigid connecting frame; the multi-barrel basic posture monitoring unit is arranged above the rigid connecting frame and monitors the displacement change of the barrel top of the suction barrel; the servo monitoring control unit collects pore pressure, soil pressure and acceleration data of the environment simulation unit, collects displacement and tension data of the tension loading unit, collects barrel top displacement data of the multi-barrel basic posture monitoring unit, and finally the servo monitoring control unit servo controls the tension loading unit to apply tension load to the suction barrel.
2. The test device for a multi-suction bucket combined foundation under earthquake and environmental load according to claim 1, wherein: the environment simulation unit comprises a vibrating table, an experiment model box and a bottom plate, wherein the bottom plate is fixedly arranged on the vibrating table, and the experiment model box is fixedly arranged on the top surface of the bottom plate in a sealing way; a rubber film is paved on the inner wall of the experimental model box, a soft clay layer simulating the seabed environment is filled in the lower layer of the experimental model box, and a seawater layer is filled in the upper layer of the experimental model box; the suction barrel is inserted into the soft clay layer, and the barrel top of the suction barrel is flush with the mud surface of the soft clay layer.
3. The test device for a multi-suction bucket combined foundation under earthquake and environmental load according to claim 1, wherein: the tension loading unit comprises a loading actuator, a loading guide plate and a guide pulley, wherein the loading actuator is fixedly arranged above the environment simulation unit along the horizontal direction, and the output end of the loading actuator is connected with the centroid of the rigid connecting frame through a steel wire rope; the loading guide plate is fixedly arranged above the environment simulation unit along the vertical direction, a plurality of adjusting holes which are arranged at intervals are vertically distributed on the loading guide plate, and the adjusting holes are rotationally connected with the guide pulleys; and the guide pulley is wound and connected with a steel wire rope.
4. The test device for a multi-suction bucket combined foundation under earthquake and environmental load according to claim 1, wherein: the multi-barrel basic posture monitoring unit comprises a fixed frame and a cross steel frame; the cross steel frame comprises a vertical detection rod and a horizontal detection rod, wherein the bottom end of the vertical detection rod is coaxially connected with the rigid connecting frame through threads, and the middle part of the vertical detection rod is fixedly connected with the horizontal detection rod along the horizontal direction; the fixing frame is fixedly arranged above the suction barrel, and a horizontal displacement sensor and a vertical displacement sensor of the servo monitoring control unit are arranged on the fixing frame; the detection end of the horizontal displacement sensor is abutted against the side wall of the vertical detection rod; the vertical displacement sensor; the detection end of the horizontal detection rod is abutted against the top surface of the horizontal detection rod.
5. The device for testing a multi-suction bucket combined foundation under earthquake and environmental load according to claim 4, wherein: the servo monitoring control unit further includes: loading a displacement sensor, an S-shaped force sensor, an acceleration sensor, a pore pressure sensor, a soil pressure gauge, a servo controller, a data acquisition instrument and a computer; the output end of the loading displacement sensor is fixedly connected with the output end of the loading actuator; the two ends of the S-shaped force sensor are respectively connected with the output end of the loading actuator and the centroid of the rigid connecting frame through steel wires; the pore pressure sensor and the soil pressure gauge are respectively embedded in the soft clay layers in the two non-adjacent suction barrels and around the suction barrels; the acceleration sensors are vertically distributed in the soft clay layer at intervals; the data acquisition instrument acquires pore pressure, soil pressure and acceleration data in the soft clay layer, acquires displacement and load data of the loading actuator and displacement data of the barrel tops of two non-adjacent suction barrels, and finally sends the displacement data to the computer, and the servo controller servo-controls the loading force and loading mode of the loading actuator according to the instructions of the computer.
6. The device for testing a multi-suction bucket combined foundation under earthquake and environmental load according to claim 4, wherein: the suction barrels are provided with four, the tops of the four suction barrels are connected with rigid connecting frames, the top surfaces of the suction barrels are provided with water pumping holes and observation holes with sealing organic glass, and the middle parts of the top surfaces of the suction barrels are provided with screw holes connected with the rigid connecting frames in a threaded mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321693236.9U CN220768186U (en) | 2023-06-30 | 2023-06-30 | Testing device for multi-suction barrel combined foundation under earthquake and environmental load |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321693236.9U CN220768186U (en) | 2023-06-30 | 2023-06-30 | Testing device for multi-suction barrel combined foundation under earthquake and environmental load |
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